Thermostat



June 11, 1935.' R, H MAUTSCH 2,004,667

TTTTTTTT AT Patented June 11,1935 I rifles THERMOSTAT Robert- Henri Mautsch, Brussels, Belgium, assignor to The Westinghouse Air Brake Company, Wilmerding, Pa., a corporation of Penn- Sylvania -Original application November 17, 1931, Serial Divided and this application March 28, 1933, Serial No. 663,149. In Great Britain November 18, 1930 Claims.

ratus for railway Vehicles and other purposes of the kind in which the radiator of the apparatus is provided with a thermostatically operated regulating mechanism, comprising a regulating rod' or tube, for automatically controlling the supply of steam to the radiator, the present application being a division of my application, Serial No.4

575,512, led November 17, 1931.

According to the principal feature of the'invention, the regulating rod or tube is composed of two or more parts welded or otherwise secured to one another, these partshaving different temperature coefficients of expansion and by providing parts of different lengths which when secured end to end as above described constitute the full length of the regulating element, it will be evident that the temperature coeiiicient of the rod or tube as a whole can have any desired value. Furthermore, the regulating rod or tube may be tubular and perforated wholly or' in part so as to reduce the mass thereof and also to permit access of steam to the interior of the element, thus rendering the regulatingr action still more prompt and efficient. For example, the regulating rod or tube may comprise an intermediate perforated tubular portion of copper interposed between and secured to two rods of the alloy known under the registered trade name Inva1".

In the accompanying drawing, Fig. 1 is a view of a regulating element for the thermostatic control of a radiator and embodying one form of my invention; Fig. 2 a view of a regulating element embodying another form of my invention; and Fig. 3 a view of another modification.

According to one form of my invention, as shown in Fig. 1, a valve element 'i is formed integral with or rigidly secured to a regulating rod or tube which may be composed of two or more parts welded or otherwise secured to one another, these parts having different relatively low temperature coeicients of expansion and by providing parts of different lengths which when secured end to end as` above described constitute the full length of the regulating rod or tube, it

will be evident that the temperature coefficient of f valve element 1 being secured to one end of thev rod.

This invention relates to `steam heating appa-v According to the construction shown in Fig. l'2,

the rod may be formed of sections 4 and 5 com-` posed of Invar and an intermediate section 6 composed of copper. The section 6 is in the form of a tube formed from a sheet of metal having spaced perforations 8, theedges ofthe sheet parallel to the axis of the tube being Abutted, but not welded or otherwise joined. f

When a perforated tube is used, the mass of the rod is reduced, and the perforations permit access to the interior of the tube, of-steam, so'

moreprompt exact desired value by properly proportioning theleugths of the sections having different coefficients of expansion.

While one illustrative embodiment of the invention has been described in detail, it is not my intention to limit its scope to that embodiment or otherwise than by the terms of the appended claims.

Having now described my invention, what I claim as new and desire to secure by Letters' Patent, is:

1. A heat expansible element for a thermostat I comprising integrally united longitudinal sections lof heat expansible and non-heat expansible material forming a uniform lineal structure.

of definite length, the heat expansible section being a perforated tube. and the' length of the expansible section being so proportioned with respect to the length of the non-expansible sections that the element as a whole has anydesired predetermined coefficient of expansion.

2. A heat expansible element for a thermostat comprising two non-heat expansible sections and an integrally united heatexpansible section intermediate the non-expansible sections forming a uniform lineal structure of a definite length, the length of the vexpansible section relative to the lengthsv of the non-expansible sectionsbeing chosen such that the coefficient of expansion of the element as a whole is a selected predetermined quantity. l

3. The method of making heat expansible elements of uniform length for thermostats having predetermined selected coefficients of expansion which consists in uniting seotions of heat' exheat expansible material and non-heat expansible material of varying lengths proportioned to provide a. uniform lineal structure of denite.v

length having the desired coefficient of expansion.

5. The method of making heat expansible elements of definite length, for thermostats having selected predetermined coeflcients of expansion,

which'cori'sistsvin uniting a heat expansible section intermediate two non-expansible sections to form a uniform integral linear structure, the

relative lengths of the several sections being lchosen to provide the desired coefiicient of expansionofthe element as a Whole.

' p ,ROBERT HENRI MAUTSCH. 

